The Post reports that Alexis had worked for several days before Monday morning's shooting at the Navy Yard. According to D.C. Police, Alexis killed 12 people, including a Fayetteville native (left), when he opened fire inside Building 197. Alexis was later killed by officers.

"To my knowledge, there is no explanation for the violence that occurred," said Senate Majority Leader Harry Reid.

Thomas Hoshko, the CEO of The Experts, said Alexis had "no personnel issues" he was aware of. Hoshko also said a background check of the suspect as recently as July revealed no criminal history.

According to records, Alexis was arrested in connection with shootings in 2004 and 2010 in Texas and Seattle, but was never charged.

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